Microsoft seems to have started a new program aimed at the end users (most of the developer related interactions seems to now be concentrated at Connect), so I am assuming this is more for the end consumers and widespread feedback loop.
If you are a XP or Vista user and agree to answer surveys and also let MS collect usage information from your PC, you can get some free MS softwares.
You can sign up at http://wfp.microsoft.com/. Do note you need to sign up for both the programs to be eligible to get the free products (Restricted to US only and for XP and Vista OSes only). Also for the second part, you will have to download and install an App that will collect and send information to MS automatically (Ahh, when will the Trolls on the secret data collection technology of MS start??)
As per the site the following are the list of software avaialble for distribution free for particpants:
Microsoft Windows Vista Ultimate (32-bit and 64-bit DVD)
Microsoft Office Ultimate 2007
Microsoft Money Plus Premium
Microsoft Student with Encarta Premium 2008
Microsoft Streets and Trips 2008